R.L. Stine is a master of taking classic horror tales and their monster stars and made them feel fresh and new again, and he's also a master of making adult horror suitable for a young audience without defanging them.
Stine is clearly quite a creative fellow, so it's only natural that such a creative guy would come up with equally creative titles for his books like "Say Cheese and Die!", "Be Careful What You Wish For..." and "My Hairiest Adventure".
But let's face it- these titles aren't totally honest about the material presented in the story.
Which is why Andrew Bridgman came up with more honest titles for all 62 original Goosebumps books, titles that are largely based on the cover art but still perfectly fitting for each story, like this book "Deep Trouble".
That really is just a shark, it only appears briefly in the story, and the main creature in the book is actually a tentacled sea monster, so yeah- not a monster, just a f#$king hammerhead shark.
See If All 62 Original Goosebumps Books Had Honest Titles here (NSFW language)